Aperture sighting device for a firearm



FIG. 1 is a perspective view of an aperture sighting device for a firearm, as seen from the front left portion, showing my new design;

FIG. 2 is a top elevational view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view thereof shown mounted on a firearm, the firearm shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an aperture sighting device for a firearm, as shown and described. 